examples/iframe/example.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>[Web-messenger] iframe main document</title>
    <style>
      #iframe {
        width: 400px;
        height: 300px;
        border: 1px solid #ccc;
      }
    </style>
    <script src="https://cdn.jsdelivr.net/npm/web-messenger/dist/webMessenger-iframeMain.umd.js"></script>
  </head>
  <body>
    <iframe id="iframe" src="./iframe.html" frameborder="0"></iframe>
    <hr />
    <button id="button">Post to iframe</button>
    <p>Press F12 to open devtools</p>

    <script>
      function log(...data) {
        console.log(
          "%c[main]" + data.join(""),
          "background: #222; color: #bada55"
        );
      }
    </script>
    <script>
      const iframe = document.querySelector("#iframe");
      let isReady = false;
      const webMessenger = WebMessengerIframeMain.registerMain(
        {
          onReady(data) {
            isReady = true;
            log(
              `[messageDispatcher] post from iframe, method "onReady": `,
              data
            );
          },
          parentMethod(params) {
            log(
              `[messageDispatcher] post from iframe, method "parentMethod": `,
              params
            );
            return "result";
          },
        },
        {
          iframeDom: iframe,
        }
      );

      const button = document.querySelector("#button");
      button.addEventListener("click", () => {
        if (!isReady) {
          log("Not ready yet!");
          return;
        }
        webMessenger.postToIframeAwaitResponse("ping", "ping").then((data) => {
          log("[response] post to iframe, method ping: ", data);
        });
      });
    </script>
  </body>
</html>